Construction was happening at Wal-Mart where 13 got sick

AVALON PARK, Fla. (AP) — Authorities say a construction crew using propane tools had been working in a central Florida Wal-Mart store where 13 employees were treated for carbon monoxide poisoning.

Fire rescue crews were called to the store after 3 a.m. Sunday when employees began complaining of headaches and dizziness. First responders detected very high levels of carbon monoxide and evacuated the Avalon Park store.

Orange County Fire Rescue spokeswoman Kathleen Kennedy told local media that levels of carbon monoxide reached 400 parts per million inside the store by 4 a.m. Sunday. Levels above 35 parts per million are considered excessive.